The official romanization is "Kokkoro", but sometimes her name is spelled "Coccoro" by fans.
She is a short and slender elf with short white or grey hair with antenna hair & hair between eyes, and pink eyes. She usually wears a two-tone green & white sleeveless dress, light green detached sleeves, and a white hair flower.
In the anime adaptation, she is memetically associated with the :x expression, which she frequently uses (she does not do this in the game.)
Alternate in-game outfits of hers include:
Her name in the real world before the events of Re:Dive was Natsume Kokoro (棗こころ).